Rename src/lib/download.* to src/lib/datatransfer.*

src/libexpr/common-eval-args.cc

@@ -1,6 +1,6 @@
 #include "common-eval-args.hh"
 #include "shared.hh"
-#include "download.hh"
+#include "datatransfer.hh"
 #include "util.hh"
 #include "eval.hh"
 #include "fetchers.hh"

src/libexpr/eval.cc

@@ -5,7 +5,7 @@
 #include "derivations.hh"
 #include "globals.hh"
 #include "eval-inline.hh"
-#include "download.hh"
+#include "datatransfer.hh"
 #include "json.hh"
 #include "function-trace.hh"
 

src/libexpr/parser.y

@@ -544,7 +544,7 @@ formal
 #include <unistd.h>
 
 #include "eval.hh"
-#include "download.hh"
+#include "datatransfer.hh"
 #include "fetchers.hh"
 #include "store-api.hh"